BDNF and migraine disorder: Higher serum BDNF levels have also been reported in the setting of other chronic pain conditions, such as fibromyalgia (Laske et al., 2007; Zanette et al., 2014), chronic musculoskeletal pain (Caumo et al., 2016), migraine, and chronic tension-type headache (Tanure et al., 2010; Deitos et al., 2015).